Stirrer



Apnl 6 1926. H. L- JQHNSTON STIRRER Filed Nov. 5. 1923 IN V EN TOR.

A TTORNEYS.

Patented Apr. 6, 1926.

. UNITED STATES PATENT OFFICE.

HERBERT I4. JOHNSTON, OF TROY, OHIO, ASSIGNOB TO THE HOBART MANUFAC- TUBING COMPANY, 01 TROY, OHIO, A CORPORATION OF OHIO STIBBER.

Application filed November 8, 1923. Serial No. 872,587.

To all whom it 121 1 concern:

Be it known that f, HERBERT L. JOHNSTON, a citizen of the United States of America, residing at Troy, county of Miami, and State of Ohio, have invented certain new and useful Improvements in Stirrers, of which the following is a full, clear, and exact description.

This invention relates to stirrers or beaters such as are used for whipping cream, and for like purposes; and more particularly to means for connecting the stirrer rods in position.

Stirrers of this character, particularly those which are adapted for use with motor operated apparatus for stirring large batches of material, are quite generally provided with a plurality of looped stirrer rods, the opposite ends of which are attached to a socket member, which is in turn adapted for detachable connection with the operating shaft of a motor or other piece of apparatus. One of the serious difliculties which is encountered in making satisfactory stirrers of this character is the prevention of rotation of the stirrer rods during operation, which causes them to work loose and become disengaged, and tends to cause breakage.

One of the principal objects of this invention is to provide a stirrer construction which is simple and easily made, and adapted to hold the rods firmly in position,

restrained against both longitudinal and rotative motion.

Another object of the invention is to provide a form of connection for a stirrer rod, or the like, which is simple in construction, effective in operation, and long lived.

Other ob'ects and advantages of the invention will be apparent from the description thereof set out below, when taken in connection with the accompanying drawing.

In the drawing, in which like characters of reference designate like parts throughout the several views thereof; I i

Fig. 1 is an elevational view of a stirrer or beater with certain parts thereof broken away and shown in section to moreclearly illustrate the invention;

Fig. '2 is a plan view of the apparatus shown in Fig. 1, with certain parts broken away; and

Fig. 3 is a fragmentary sectional view of one end of a single stirrer rod in midamembied position.

This invention is of general application and is applicable to a stirrer of any general character, whether intended. for hand or power operation, and whether the stirrer has one or a pluralitypf stirrer rods; but as illustrating a preferred embodiment it is shown in connection with a stirrer, having a plurality of stirrer rods, which is adapted for attachment to a power driven machine.

This stirrer comprises a body or socket member 10, which has a cylindrical extension 11 within which is formed a type of bayonet groove 12 adapted to receive oooperatlng retaining lugs upon an operatin shaft not shown. The socket member 101s provided with a depending inclined rim 15, which has a groove 16 therein, extendin around the socket member 10, thus provi ing two ribs or flanges 17 and 18, the rib 17 being adjacent the upper face of member 10 and having its upper face preferably in the plane of the'upper face of the main portion of the socket member. The rib 18 is spaced from the rib 17 and is preferably adjacent the lower edge of the rim 15. The ribs 17 and 18 are provided with a plurality of aligned passa es 20 and 21, which are so arranged that the axis of each of these sets of aligned passages is inclined to the axis of rotation of the stirrer, as clearly shown in Figs. 1 and 3. These passa s 20 and 21 are preferably cylindrical and are of proper size to snugly but slidably and freely receive the stirrer rods 22. a

The socket member 10 is "referably made of a material which is relatively softer than the material from which the stirrer rods 22 are made. In practice the member 10 is generally made of aluminum while the stirrer rods 22 are of steel.

In assembling each of the stirrer rods in position one end of such rod is flattened, as shown by the numeral 23, in Fig. 3, so that fiat lateral extensions are provided at the extreme end of the rod. lhis stirrer rod is then passed through two of the aligned assages 20 and 2 1, with the flattened ens above. It is then 100 ed and the other end of the rod asse upwardly through a second set of aligned passa cs 20 and 21, preferably through a set 0 passages whlch are substantially diametrically op osite' the set within which the flattened mi of the rod is positioned. This second end of the rod is t en also flattened, as by hammer blows or the like, so that it is also provided with flattened lateral extensions. The two ends of the rod are then pressed downwardly so as to force these flattened extensions into the passage 20, and since the metal of the rod is relatively harder than the metal of the socket member 10, each lateral extension will cut a groove in the metal of the socket member. This looks the two ends of the stirrer rod in place, against rotation.

In order to prevent the stirrer rods from moving in a reverse direction, so that the lateral extensions would move out of the rooves which they have cut thus no longer fielding the rod against rotation, a retaining ring 25 is provided, which is clamped to the top surface of the socket member 10, over the passage 20, by means of bolts or screws 26, or the like. The flattened ends of the stirrer rods, and therefore the stirrer rods themselves, are thus retained in place.

It is not necessary that the rods be assembled in lace in the precise manner described a ove. If desired the two ends of the rods may be inserted through their respective aligned passages and each end then flattened, after which these flattened ends may be pressed in the proper directions to cause the formation of its extension retaining rooves. It is a matter of indifference whet er the end of the rod is flattened before or after the rod is positioned within its receiving passages.

During operation these stirrer rods tend to continuousl flex about their point of connection an this in turn tends to cause the rods to break at substantially the point of flexing. With the construction shown in Figs. 1 and 3 this breaking of the rods is prevented, for the rod is held at two 5 aced places by the ribs 17 and 18, and t e point of flexure tends to fall within that part of the rod which is between these two ribs. Consequently, during operation, the rod is not bent or flexed over a sharp edge, as would be the case if the rib 18 were dispensed with, and therefore the tendency toward breakage is avoided.

While the method herein described, and the form of apparatus for carrying this method into eil'ect, constitute preferred embodiments of the invention, it is to be understood that the invention is not limited to this recise method and form of apparatus, and that changes may be made in either without departing from the scope of the of the invention which, is defined in the appended claims.

What is claimed is:

1. In a stirrer or heater, of the character described, a socket member, adapted for attachment to an operating shaft, having a passage therethrough; and a stirrer rod mounted in said passage and held therein sage therethrou h, and a stirrer rod shaped to sungly fit said passage and of harder material than said socket member, and a laterally extended portion at the end of the stirrer rod entered into the wall of the said assage in such wise that the said extended portion forms a groove adapted to restrain rotative motion of said rod within the said passa e.

3. In a stirrer or heater, of the c aracter described, a socket member having a assage therethrough, a stirrer rod shape to snugly fit within said passage and of harder material than said socket member, a laterally extended portion at the end of the stirrer rod entered into the wall of the said passage in such wise that the said extended portion forms a groove adapted to restrain rotative motion of said rod within the said passage, and means for holding said rod against reverse movement out of said assage.

4. n a stirrer or beater, of the character described, a socket member having a passage therein which is circular in cross section, a stirrer rod mounted in said passage, and means for restraining said rod against rotative movement within said passage.

5. A stirrer or heater of the character described, comprising a socket member having a passage therethrou h and a rod mounted in said passage and retained therein against rotative movement by means of a lateral extension upon said rod which is positioned within a self formed groove receiving said extension.

6. A stirrer or heater of the character described, comprising a socket member having a passage therethrough, a rod mounted in said passage and retained therein against rotative movement by means of a lateral extension upon said rod which is positioned within a self formed groove receiving said extension, and a ring mounted upon said socket member for retaining the rod end within said passage.

7. In a stirrer or beater, of the character described, a socket member having 0 positely positioned passages each of whic is circular in cross section, a looped stirrer rod having its ends mounted in said passages, each end having an extension thereon positioned within a self formed cooperating groove to hold each said end against rotation within its respective passage.

8. In a stirrer or beater, of the character described, in which a stirrer rod is mounted within a passage in a socket member; the method of mounting said stirrer rod to prevent rotation thereof, which consists in extending said stirrer rod through said passage, flattening the end of said rod to extend the flattened portion laterally, and forcing the flattened portion into said passage to cut a groove which receives the said laterally extended portion.

9. In a stirrer or beater, of the character described, in which a stirrer rod is mounted within a passage in a socket member, which member is of material relatively softer than the stirrer rod; the method of mounting said stirrer rod in position to prevent rotation thereof which consists in extending said stirrer rod through said passage, flattening the end of said rod to extend the flattened portion laterally, and forcing the flattened portion into the said passage to cut a groove within the softer metal of the socket member which receives said laterally extended portion.

10. In a stirrer or beater, of the character described, in which a stirrer rod is mounted within a passage in a socket member; the method of mounting said stirrer rod, which consists in extending said stirrer rod through said passage, flattening the end of said rod to extend the flattened portion laterally, forcing the flattened portion into the said passage to cut a groove which receives the said laterally extended portion, and positioning means for holding said rod against reverse movement which would move said laterally extended portion out of said groove.

11. The method of constructing a stirrer or beater, of the character described, which comprises a socket member, having opposed passages formed therein; which consists in forming a laterally extension on one end of the stirrer rod, passing said stirrer rod through one of said passages, looping said rod upon itself and passing the other end thereof, in a reverse direction throu h the other of said passages, treating the said last named end to form a lateral extension thereon, forcing the two ends of the said rod in the same direction through the cooperating passages to cause the said extensions to cut grooves within the metal of the said socket member to receive the said extensions, and aflixing to the said socket member means for preventing reverse movement of the ends of the said stirrer rod to thus hold the said extensions in their self formed grooves, to restrain each end of the stirrer rod against rotation within its respective passage.

12. The method of constructing a stirrer or beater, of the character described, which comprises a socket member having opposed passages formed therein; which consists in forming a lateral extension on one end of a stirrer rod which is of harder metal than the said socket member, passing said stirrer rod through one of said opposed passages, looping said rod upon itself and passing the other end thereof, in a reverse direction through the other of said opposed passages, treating the said last named end of the rod to form a lateral extension thereon, forcing the two ends of the said rod in the same direction through the opposed passages to cause the said extensions to cut grooves within the metal of the said socket member to receive the said extensions, and aflixing to the said socket member means for preventing reverse movement of the end of said stirrer rod to thus hold the said extensions in their self formed grooves to restrain each end of the said stirrer rod against rotation within its respective passage.

13. In a stirrer or beater, of the character described, a socket member having a passage therethrough which is circular in cross section, and a stirrer rod shaped to fit within said passage and of harder material than said socket member, and a laterally extended portion at the end of the stirrer rod entered into the wall of the said passage in such wise that the said extended portion forms a groove adapted to restrain rotative motion of said rod within the said passage, and to prevent movement of said rod within the passage in one direction.

14. The method of constructing a stirrer orbeater of the character described, which comprises a socket member having opposed passages formedtherein; which consists in positioning a stirrer rod having a lateral extension on each end thereof in said passages and forcing each end of said rod along its respective passage to cause the extensions on the ends of the said rod to cut grooves in the sides of the respective passages to receive the said extensions.

15. In a stirrer or beater, of the character described, a socket member, spaced peripheral flanges thereon, said flanges having aligned passages therein a stirrer rod having one end extendin through one of such aligned passages and firmly mounted within the other of such passages, that part of the end of said rod lying between the said flanges being out of contact with the socket member.

16. In a stirrer or beater, of the character described, a socket member, spaced apart portions thereon, said spaced portions having aligned passages therein, a stirrer rod, having one end extending through one of such aligned passages and firmly mounted within the other of such passages, said rod having one end flattened and positioned within a self formed cooperating groove in the socket member.

17. In a stirrer or beater, of the character described, a body member, spaced peri heral flanges thereon, a plurality of aligne passages in said flanges,a looped stirrer rod having each of its ends extending through one of the passages in one flange and firmly mounted within the respectively aligned passage in the other flange, each end of said looped stirrer rod having an extension thereon positioned within a self formed cooperating groove in the flange bearing such respectively aligned passages,

18. A stirrer or beater, of the character described, comprising a body member, spaced apart portions thereof, said spaced portions having aligned passages therein, a stirrer rod having one end extending through one of such aligned passages and firmly mounted within the other of such passages, the portion of the stirrer rod lying between said passages being out of contact with the body member, said spaced portions being so spaced that if the free portion of the stirrer rod is bent with res ect to the portion positioned within the aligned passages therein, that portion of the rod positioned within such aligned passages will also tend to bend with a center of flexure located within that portion of the rod within the space between the spaced apart portions.

19. A stirrer or beater, of the character described, comprising a body member, having a passage therethrough; a rod having a lateral extension on one end thereof mounted within said passage by introducing the unflattened end through the said passage and forcing the flattened end into the said passage to form a retaining groove, the said rod being held against rotative movement and against longitudinal movement in one direction by means of said lateral extension and said cooperating self formed groove; and retaining means detachably connected to the said socket member after the rod is positioned in place, for restraining said rod against longitudinal movement in the other direction.

20. A stirrer or beater, of the character described, comprising a body member, having a plurality of passages therethrough, a stirrer rod having a lateral extension upon one end thereof, mounted within the said passages by passing the end having no extension thereon through one of the said passages and looping the rod upon itself to extend the same said end through the other of said passages and then forming a lateral extension upon the said end, forcing each of the said ends along its respective passage to form a retaining groove for the extension thereon; and a removable retaining plate constructed for attachment to the body memher after the ends of said rod have been each forced into its respective passage.

In testimony whereof I hereto afliicmy signature.

HERBERT L. JOHNSTON.

sage in the other flange, each end of said looped stirrer rod having an extension thereon positioned within a self formed cooperating groove in the flange hearing such respectively aligned passages.

18. A stirrer or heater, of the character described, comprising a body member, spaced apart portions thereof, said spaced portions having aligned passages therein, a stirrer rod having one end extending through one of such aligned passages and firmly mounted within the other of such passages, the portion of the stirrer rod lying between said passages being out of contact with the body member, said spaced portions being so spaced that if the free portion of the stirrer rod is bent with respect to the portion positioned within the aligned passages therein, that portion of the rod positioned within such aligned passages will also tend to bend with a center of flexure located within that portion of the rod within the space between the spaced apart portions.

19. A stirrer or beater, of the character described, comprising a body member, having a passage therethrough; a rod having a lateral extension on one end thereof mounted within said passage by introducing the unfiattened end through the said passage and forcing the flattened end into the said passage to form a retaining groove, the said rod belng held against rotative movement and against longitudinal movement in one direction by means of said lateral extension and said cooperating self formed groove; and retaining means detachably connected to the said socket member after the rod is positioned in place, for restraining said rod against longitudinal movement in the other direction.

20. A stirrer or beater, of the character described, comprising a body member, having a plurality of passages therethrough, a stirrer rod having a lateral extension upon one end thereof, mounted Within the said passages by passing the end having no extension thereon through one of the said passages and looping the rod upon itself to extend the same said end through the other of said passages and then forming a lateral extension upon the said end, forcing each of the said ends along its respective passage to form a retaining groove for the extension thereon; and a removable retaining plate constructed for attachment to the body memher after the ends of said rod have been each forced into its respective passage.

In testimony whereof I hereto affix my signature.

HERBERT L. JOHNSTON.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,579,323, granted April 6, 1926, upon the application of Herbert L. Johnston, of Troy, Ohio, for an improvement lIl stlrrers. errors a pear in the printed specification requiring correction as follows: Page 2, line 3, claim 2, after the word fit insert the word within; pzge 3, line 39, claim 11, for the word lateraly read lateral; and that the said tters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 4th day of May, A. D. 1926.

M. J. MOORE, Am /ing C'mmmasioner of Patents.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,579,323, granted April 6, 1926, upon the application of Herbert L. Johnston, of Troy, Ohio, for an improvement in Stirrers, errors a pear in the printed specification requiring correction as follows: Page 2, line 3, claim 2, after the word fit insert the word within; age 3, line 39, claim 11 for the word lateraly read lateral; and that the said tters Patent should be read with these corrections therein that the same may conform to the record' of the case in the Patent Oflice.

Signed and sealed this 4th day of May, A. D. 1926.

M. J. MOORE,

Achng C'ommuszom of Patents. 

